<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>1-前置递增</title>
	</head>
	<body>
		<script type="text/javascript">
			//前置递增：先自己加，然后返回原值
			var num = 10;
			++num;//相当于num = num + 1
			console.log(num);//11
		</script>
		
	</body>
</html>
